MathSciNet bibliographic data MR1840773 (2002d:33028) 33E05 (11F11 11F27 33C50) Chan, Heng Huat; Liaw, Wen-Chin; Tan, Victor Ramanujan's class invariant $\lambda\sb n$$\lambda\sb n$ and a new class of series for $1/\pi$$1/\pi$. J. London Math. Soc. (2) 64 (2001), no. 1, 93–106. Article

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